Workers often underestimate how much leverage they have against upper management because they put too much stock in job titles, experts say. "Power really resides in one's dependence on somebody else, and their dependence on you in the other direction," says Adam Kleinbaum, a professor at Dartmouth's Tuck School of Business. Professionals can increase their power by becoming indispensable and by building a solid internal network to make themselves less reliant on any one person, experts say.